Abstract
A dissipative mechanism is presented, which emerges in generic interacting quantum field systems and which leads to robust warm inflation. An explicit example is considered, where using typical parameter values, it is shown that considerable radiation can be produced during inflation. The extension of our results to expanding spacetime also is discussed.
Highlights
Inflationary dynamics inherently is a multifield problem, since the vacuum energy that drives inflation eventually must convert to radiation, which generally is comprised of a variety of particle species
We expect similar robust radiation production for decay of the heavy scalars into gauge bosons. We did this zero temperature calculation first due to its tractability, an interesting fact emerges for inflationary cosmology, that even if the initial state of the universe before inflation is at zero temperature, the dynamics itself could bootstrap the universe to a higher temperature during inflation
The relevance of the analysis in this letter extends beyond warm inflation, since the interactions studied here are exactly the same as found in supercooled inflation models
Summary
Inflationary dynamics inherently is a multifield problem, since the vacuum energy that drives inflation eventually must convert to radiation, which generally is comprised of a variety of particle species. Considerable work has demonstrated its phenomenological significance [3], one key barrier to the warm inflation picture has been establishing plausibility of its dynamics from first principles quantum field theory To some extent this point has been overemphasized for warm inflation, since in similar respects particle production during the. As has been noted [2,7], very little radiation production during inflation, at the scale of tens of orders of magnitude below the vacuum energy density, is already sufficient to affect large scale structure formation and create an adequately high post-inflation temperature With these thoughts in mind, in [7] a simple attempt was made to circumvent the specific constraints of the high-temperature formalism, by examining dissipation at zerotemperature.
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